• A 72-year-old male presents with an ill-defined, deep-seated mass in his right calf. It has grown appreciably in the past few months and is now roughly the size of a golf ball. A core biopsy is performed, and a representative section is shown here. The tumor cells stain positively with antibodies to CD34 and CD31. What is the most likely diagnosis?

• A. Angiosarcoma• B. Desmoid tumor• C. Leiomyosarcoma• D. Lymphoma• E. Rhabdomyosarcoma

Thrombophlebitis)...red, inflamed streaks along the course of veins

 LEG